Sand-blast machine



sept. 11,1923.

L. M USTE SAND BLAST MACHINE Filed Oct. 9. 1920 V/ y l.

Patented Sept. ll, 1923.y

narran stares rarest orFliCE,

SAND-BLAST MACHINE.

Application filed October 9, 1920. SerialA No.. 415,838.

To all lwhom t may con-cern Be it known that I, LEONARD MUSTE, a

citizen of the United States of America,

residing at Grand Rapids,in the county of Kent and State of Michigan,have invented certain new and useful Improvements in Sand-BlastMachines; and I do hereby declare the following to be a full, clear,`andexact description of the invention, such as will enable others skilledin the art to which it appertains tomake and use t-he same.

This invention relates to a sand blast construction for the projectionof sand under air pressure against any surface to be finished by theabrasive action of the sand. It is a prim-ary object and purpose ofthepresent invention to make a machine of this character and equip it withmeans for causing an eveny feed of 'sand to be acted upon by airpressure so that at all times the sand shall flow evenly from themachinel without plugging or stopping of the sand flow. 'A furtherobject of the invention is to separate any water or oil from the sand orfrom the air going to the sand which causes the intermittent projectionof wet oily sand from the machine, this being very undesirable yin sandblast machines. A still fur- -therobject of the invention is to providemeans whereb-y the sand at the bottomy of the sand holdingreceptacleshall be acted upon directly by air pressure to force it from thereceptacle into the air current, and at the same time cause the entirequantity of sand in said receptacle to be forced downwardly thereinl byair pressure. Many other objects and purposes, all tending to simplicityof structure, cheapness of constructionand repairv of the same, Vandease .of obtaining parts for repair from regular stock carried byretailers of plumbing supplies, will appear fully as understanding ofthe invention is had from the following description, taken in connectionwith the accompanying drawing, in which, f y

Fig. 1 is a vertical section through the sand blast machine. v,

F ig. 2 is an enlarged vertical section through the oil and waterseparator, and

Fig. 3 is an enlarged vertical section illustrating the construction4and connectiorrof the parts through which the sand passes from theholding receptacle tof the air pipe. Like reference characters refer toalike parts in the different figures of the drawing.

.coupling 18.

In thev construction, a sand holding receptacle is usedcomprising acylindrical shell l of metal,`the upper end :of which lis vclosed-,by atop plate 2 while a bottom plate 3 is secured` below the ltop platebutga distance above the lower end ofthe shell, parts of the shell belowthe -bottom being out away to leave feetlforsupporting the :shell on thefloor.l .The top plate 2has`a ange 5 secured4 thereto havingnathreadedfopening through it for the entrance of a closingplugA 6. Sand.is entered linto the receptacle through the opening inthe flange, thisopening-afterward being closed by the plug 6. The bottom, also has lan.opening Zmade through it and a flange 8 -is connected to the bottomatlsuch opening.` The flange 8 also has any opening ythrough .it into,which a nipple y9-is screwed, connecting tol whichis an ordinary plug'valve casinglO, anplug valve llbeing rotatably ,mountedthere'in A secondnipple 12,is-threaded into the` lower endcf. valve casing `10 andaT-.coupling 13 connected with the lower endrof the nipple. Arod la iskattached to .the valve 11 and extends outwardly beyondfthe wall of theyshell ofthe receptacle, being turned upwardly to make a handle 15 forturning the valve from open to closed lposition and back.` n

yA section of pipe lpasses through one side ofthe shell 1 and anr airtight r'connection is made at ythepoint of passage by suitable locknuts17 jas shown. .This pipe at its inner end screws'into `one end of`across An upwardly extendingpipe 19 threads into the crossrat its upperside anda similar pipe 2O into the lower side,

the former extending nearly to the top plate v2. "and ythe latterl'nearly to .the @Peiling 7 which a vertical sectionof pipe`24Lconnects,

it inturn beingconnected by a union 25 with a lsecond vertical pipe 26.Pipes 24 `and 26 parallel the. sideof the shell, and

pipe 26 at its lower end'is joined byl'an elbow 27 with oneend offahorizontal pipe28, the other endof which threads into one end oftheT-coupling a` relatively long distance so as to pass bythe lower endv ofthe nipple 12,v ass-hown-inlfig. 3, pipe 29 threads i into the oppositeend of the T 13 and extends outwardly a distance, having one end of ahose connectedl thereto.v The hose may be of any desired length andequipped at its end with the usual nozzle, they same as in all sandblast machines.

The air which is to pass through the pipes described is in many casesmore or less impregnated' withV water and oil, the latter coming fromthe air-compressor. I have devised a novel separator for the oil andwater vwhich is interposed in the air passage pipes between the airreservoir and the sand blastl machine. In the construction of theseparator', a length of large pipe 31 is used and threaded at both endsto receive upper end lower closing caps 32 and 33. The air from the aircompressor or air tank passesA intoV the compartment thus made through apipe 34 threaded through the upper cap 32. Preferably, a shut-off valve35 is placed in the entrancev pipe, indicated at 36, and the part 34 isa nipple connecting the valve with the cap 32. Vithin the separator, acone 37 of metal is located at the upper end of a conical screen 38, thepoint ofthe cone coming directly below the lower end ofI nipple 34,andthe screen extending outwardly to thev bottom of the separator.Theoutlet pipey 39 from the separator xtends throughl the screen andinto the lower ypipe 39.

portion of the cone 37, passing through the bottom cap 33 and havingthreaded connection with a second shut-off valve 40, from vthe lower endof which a nipple 41 extends and,c0nnects to the outer end of thesection of pipe l'by means of an elbow 42. The separatorV lies alongsideof the shell 1 near the upper end thereof and is braced by a bracket 43to hold the same stationary. A gage 44 is. connected with the upper capof the separator, and a drain cock 45 with the lower cap as shown. Y

. l/Vithin the sand containing receptacle, a funnel-like member 46 ofsheet metal is placed, its` lower end coming around the opening, 7 inthebottom 3, the sand being carried'down the sides of the member to theopening.

In operation, lthe air coming to the separator strikes against the pointof cone 37 and isdirected outwardly against the inner sides 'of the wall31and must come back through the screen 38 in order to 'pass out throughAny oil ,or water in the air is screened therefrom and goes to thebottom ofthe separator where it may be drained offk through the cock 45.The air, freed of the oil and water passes from the separator andthrough pipe 16 to the cross 18, and thence upwardlythrough pipe 19 anddown through pipe .20, this causing the sand to have-airy pressure"exerted upon it entirely over its upper surface, while the pressure ofy air at the lower end of pipe 20 forces the sand through the opening 7,the nipples 9v and 12 and through the opening in valve 11 when turned toproper position. The excess of air passes out through pipe 21 andtherefrom through the various connections to the T 13 passing from theend ofv pipe 28 and causing a suction on the sand which draws the sandinto the air current as it passes outwardly through pipe 29 and hose 30.The pressure of air at the lower end of pipe 20 insures that the sandshall not clog or block in passing through opening 7 to the T 13 andstops the sand from packing in the bottom around and above opening 7from pressure from above.

This construction of sand blast machine is effective and may bemanufactured at low cost. All of the parts can be made withcomparatively simple threading tools, except such parts as are alwayscarried in stock in plumbing supply houses where they can be readilyobtained. The control of the different valves are all at the same sideof the machine, and easily accessible. Access to any part of the machinefor repair is easy, practically any part liable to need any repair beingon the outside and easily reached. Repair parts likelyto be `needed arefound always in stock or can be obtained at any plumbing shop. The oiland water separator is simply constructed and may be cheaplymanufactured. The stand is always free from accumulations of water oroil and dry sand is sure to be delivered from the Inachine'.. @loggingor stopping of' the lsand from the sand containing receptacle is insuredagainst. struction is practical and eiicient, and may be manufacturedand marketedat low cost. The appended claims define the invention and Iconsider myself entitled to all formsof construction falling withintheir scope.

I claim:

1. In a construction of the character described, a container for sandhaving a botA tom with an outlet thereto, an air conduit pipe passinghorizontally through the container between its upper and lower ends, asecond pipe located substantially horizontally under the bottom of thecontainer, a third pipe connecting one end of each of the first andsecond pipes, means located between and connecting the bottom'of thecontainer with said second pipe, whereby sand in the container may bepassed therefrom through the outlet to said second pipe, two oppositelyextending vertical branch pipes connected with the rst pipe inside thecontainer, one extending nearly to the upper side of the container, andthe other to a point directly over said bottom outlet, and means forcontrolling the passage of sand from the container to said second pipe.

2. In a construction of the character described, a container for sandhaving a bot- In every respect the contom with an outlet thereto, an airconduit pipe passing transversely through the container between itsupper and lower ends, a four-way coupling'interposed in the length ofsaid pipe within the container, upper and lower branch pipes attached tosaid coupling, said upper pipe terminating near the upper end of thecontainer and said lower pipe directly over the opening in the bottom 0fthe container, a Vertical pipe con nected to one end of said rst pipe, asecond horizontal pipe connected to the'lower end of the vertical pipeand passing under the container, conduit connections between saidcontainer and the second vhorizontal pipe for the passage of sand fromthe container through said bottom Opening to the second horizontal pipe,and means attached to the opposite end of the first pipe to filter the`air before its passage toy said pipe, substantially as described.

In testimony whereof I affix. my signa;

ture.

LEONARD MUSTE.

